[BUG] s3filestore plugin doesn't limit upload size

[vabatista]

Describe the bug
I'm using s3filestore plugin 1.0 with CKAN 2.10.
I set ckan.max_resource_size=250 in ckan-config.ini

When I try to upload a large file (i.e. 1Gb), there is no error message. Instead I'getting a "connection reset" in the browser, with no response in developer tools.

My application runs inside a docker container based on ckan/ckan-base:2.10.1. I don't use datapusher.

Expected behaviour
CKAN shows a message to inform user that the file exceed maximum size